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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be41cbc26ff78b62224c1553316be2fc870502e57624013bd31428a8feaab144' 
  AND token = 's2BFtsCbU/2mCNx065P7S6/+KBCst5kEEzpJkJt0LzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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