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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52cd04ae8bee2cda4bffec47e95d6d99ae2cb126e3519d669d4644b39666925' 
  AND token = 'uEjFQmC8Up1XwDVVATQXtLgzUZH1og71aO5mIx3p+sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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