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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b7808d9b99e90e40655b0dc3f369db013799962e2b65dcab555485a92b3ae9' 
  AND token = '0qjVllC4JTUnNgF3p7kktHJy1MwnavrGscOYwXHpAK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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