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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516d67ad159e340321c17ddcd8e5fcc9272ec5fa00e9611ca885f4c9a74bfa61' 
  AND token = 'B+kqmjeFMMCLi6ecLeNS8/6HCOclV6994+fBW6wGpcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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