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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eafc4da790bc944006a519d01af6d8fabb5bada3499d28393b7979f85525e3' 
  AND token = 'QNlBcyChp0w0jRsyN9iTSUweFuEGKFBs4/Dh+aSPQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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