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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa32c16fcc486cff5822015f6b0214c193e5c865fcb3682ebb0865b8aeb705b' 
  AND token = 'CZ8wY0lnwqxLHPPbwpxWGllQI9jMl0FVNZdr0Ual03s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00702

JSON explain

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