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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6312373a8f0282d8410f8fb62298a48a433ab7dc8a50337a3352d58cf59e376' 
  AND token = '32L1tLPCqbCBNPw2wkQunS6KRUp1KLhEotWvb6AqujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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