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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf876fcacf570839b34769816f0df7e9dcc2a7a7138e2407e303499b28fc539' 
  AND token = 'pVCb7n7eypWP7JPicox8pGoM1r4zkBFXaLbYgcbmdbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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