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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286e8d703b7dc2a2c8434de78673fe57025bd96c4a7be01bf62e7b25e8cf45a9' 
  AND token = 'v9XPWNLZAmSsn4h0Tb7rD1J7lksDW66QADzMHwO/vBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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