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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d070eae908ea0c842b8dad55c56143c2ad211512b4182dc1e637262e12bc73' 
  AND token = 'YWkOSrqSSm5olutN3O4JtJr9qizoS3/s7WhpBMhFhrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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