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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd607ce31e9b343954536b57ecc4ebaa6dd40199db6913bfc0de9ed0038989d' 
  AND token = 'c5CWzDQu00KIx2MlnJV+Xj0BfYJozKCdW8Ahk1Qsl6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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