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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc942979e7e10b8b54f681d91e94d774a3a097b884adc8a3f04fb3cc202b0012' 
  AND token = 'ri2cAYvstSrD181z1Hv/DeXoUbLP4aRzqrKpqLto8LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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