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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6739e22aa7e83900dc2b7e28774aaa6885759e9bd5229c0297c428103ae377b6' 
  AND token = 'j+g7pUpwRSByq0ZLbNtlw81cdMyo2WKY/PJijUqhD3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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