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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccac67b14ccd82b90ecad91e36845db23d16fd2aa5079aadc6f2399f64df9b94' 
  AND token = 'Jq53e7zR6M+AUoZluIvIdrr730PFBAhzE8qTNsrh1ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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