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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712a435cef9fe682a366814c88934347bd75606a73e844842511d7523d25e5ad' 
  AND token = 'bI/Lj7fxDqKE/IFbMEiz1hil74Fzk0TZHDLWgtxLjPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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