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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aca62afd0528965d3c721db2d3be3a42d97d93213f2042ce1d34126e3808f0c' 
  AND token = 'vRftTRpiyszSgCjU23Qro7n+Qcc2KsHAgWsmG9/+WKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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