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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0ffcbac41e1d7b94051325d62f351b08dfeb1c33c8e0830f3fef9c2c0cc512' 
  AND token = 'ltcqg8i0TWVuiH4oJ6TGUZ7eWD79pf3mzfZ+BLtesB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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