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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f570cbae01d187d39ce17d32ca5bf856cf9ca1616cc8beba8edd5c435706401' 
  AND token = 'ad7+T1joQtxpvUNY7F0rcVB8J9H8R4sGKsQNms0fO0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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