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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb817c3b04c427f01add0b4f07453f961ec3ab3ed3831bc7747d3ff737faaa' 
  AND token = 'sDfuOgINECOOIFUBKN+phKVxU3zhtrfVMF9Y6S6rUAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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