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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9aa0a25fff214b0858f00fe5c7d6bc8fd4e018065605a58a700b02fca6e43d' 
  AND token = 'do4bkOio7vtHn3dmdlSP/Gm/5LvTHUw9PyR/WayHNGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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