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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba2a55245f23435b1b83f03c7b1287e99bc3c83d221576474005bd5d6a95117' 
  AND token = 'nvsTtxVJ8nOHBm5Tvh0Os+p3YFFofaq1sRkKbImRlds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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