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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b7f14d7a45a0fdd50c2e9f23018c941af3a4aace4a9d1c7f5e6e82c6c7eaf2' 
  AND token = '6URHBoOgF/mwTMqiRd2s6nZhCRhixKRb5G7HqIhTLMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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