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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e2de93000c0b917ca0165d8c074c365b6dfd81ad3ca41d33fc64a0c8e03203' 
  AND token = 'By/uP/oUDhMIWNVGhVIKiwBaj0fF4hy3J3V4u1UroRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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