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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20626e60da2d85764d90377a59f0ce7164b4a00eb90f282cadc0586d8f199482' 
  AND token = 'ViOoaCpj0tULov4lycgutM1R6Up9yTWQFMsXnUYISKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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