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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5401411a43ee546d5b0bd89268564535c330904cca5df18f0fe5926763d80e' 
  AND token = 'Xw83eyUyOus+ElOm14l1uC3RPnNuG1lEKXicHZnZUxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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