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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb7487054317a1cfd3503aa07245e69c893764634830137d6cf042c5ccf4423' 
  AND token = 'aW/t7zxefTmhBYkwYpdMMymL1FE7tYVl79xGzdduBAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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