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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618fd4d77819333474287177f341643ea45bf5ad409a3fde1ce6ea864b267cb7' 
  AND token = 'NQtC8FAWFpfHnGaBN9SI+StOj0tDheq8+d1N1ko83XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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