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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564c5ddd1a8b68aeec52b5e95e8293ded07944bbc6d58b0f1b8c26851bb25777' 
  AND token = 'PZlkGVepGh+Fp04z7qHmpE0QMF/+npE2mufrceZZy6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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