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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224c5314c0b11dbcb8eb4a983e8020b13e343287171de4556b3099b9f9f61555' 
  AND token = 'Ln9IyPWme2D1prmwxdJcvWRMuf7nZA4LxSRuFOIbCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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