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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a930498adaf11533f0e58907d7b629d4cc863630a622ef7f67cc6c77629a31b9' 
  AND token = 'PST4H0PfDNTSh+J33H5LKtE+mmY6xqCtcgnQwZK4eVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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