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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd676e5e3bd7a1bded475925f31d34d75f16f870b2b2920b3c57618be6dc7ec' 
  AND token = 'NWBb1RnXKxRrcvuRf8PwaG2nzbk50fyD6uniJdKNjn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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