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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b68b617116e07490f64bc10c20a6a605d74525ba717110ecd87f712754c986' 
  AND token = 'uyVhqrTeqsKLO9RKQRU77D0PwfXxTCcFneJySns6cbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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