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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c7cf428d4e52b6354781f89e2d7ab459d7613d3dd671029ef5e16e4ba7caf0' 
  AND token = 'v6eEBcptiKKedbF1dnYYyIPudRePEMoQzuE41k741nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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