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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40aba4e6ec4cbef448b6d34a99494881c63fa990a85ff4ef428692ebfc9f5172' 
  AND token = '7Sq3D1r5/uO2TLIcvuZXjYgeu3xCFxldN4PAxitquJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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