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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0b48b7ff1baa93ec904135d2b123fd38aa1a80ccb215e4e68cf35afe7c8324' 
  AND token = 'mcwo2MmcqobzXu9YNsmB/bCeI+xEJb/VGkIxRwplwss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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