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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11deebeb6415e5de09703971377e3da060fef7ff302ff3b2700174196dc5d256' 
  AND token = 'jPEOniXiS+Iiy81u/zY2kdMKYW5vaEzzeJVOs9Avtmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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