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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf6230318989479db5d8d3cfdc45935306df853b536e875b37d59e28a10a250' 
  AND token = 'Ca0SzdQnRYKEkUtI9zvX3xkGka2l8/j7Vj34ofRWBEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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