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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a981c25c063fc1404427d4cbee373d3f9eac951fa4a01cbef5fd800a98cfa01b' 
  AND token = 'VhtL6bZi5oHHKnARQLEFYnjVYecboqKzgp1Ke0PkayY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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