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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240bdcadd1ff462f07bb515fe6b1c6fc03b00ad155103b950ce2e886386dc2cf' 
  AND token = 'Q7OmBkmdt2vJ6gM9l7B03fmD5EF0uaf3CYsK4O5KM0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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