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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec43fa932b73850fadb920656d2e7ea476898a9b178aefdfaca9754118fdc586' 
  AND token = 'w+JpN7mlvefixsfZ5NRoSarw64uFd0NzcD53DAbCKBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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