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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cef5bd8fc631c4f67131e5586ccc576998ee7f35ddca471731e83b0b314bec' 
  AND token = 'wGJ9jiDNx5CvcnKtW6fQa/kSCN8WUSeP+pYOxFpAO80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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