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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeb52a4c7bb57b71129c5a2bc24cb001d69861751e40e4901d4accf4600af7d' 
  AND token = 'DYuVWzNAl2KL1g7eBimN2snEX9TWS/TEN3Qooo3i7r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}