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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f126ded51af8871411929370ba5bd700fcbb68ccd4fd7923cfa52220603d92' 
  AND token = 'I0yFSRtRw1OL+dCZb+VyPCjv8G2LU83A10WtsRdeKwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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