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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0569daf7c2fb84b7af952b00b16f306618e4059bb6bf45cfdc09ad8bb7280581' 
  AND token = 'p/xb5NmqkpMlVNVYBxIFXOE93SKqH0gwwUEJbriLqmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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