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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bd379989180525a29fb96006b08456d7ca64e42d0a5a67b53648141bf49975' 
  AND token = 'SxibdxeDPLTXUKx0Y19zhApejAsaoD5QHMfODmR4cWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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