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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430eaad6c8009b8353abc99509deb31c0ca0f77fcec17696579325df2ea803ca' 
  AND token = 'rC4YuNQM+kR7f+Ua+G/CLD8tPdUAfWHSjqQmLRd8B1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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