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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33fec9462dfec516652d04e41a3713f725c5e9257267a7da24ca5bd4b102b9d' 
  AND token = 'lBkGBzleVj4iQmAQlAbQNf283qlo9UXtH2FNb/NXv1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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