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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d0ab1e036048a41ab3025131b149ae07bb380db2f720f2d994a2eb0f3b54bc' 
  AND token = '7kv6IocGSTv+5jiQp5biS37rK/XDq6Bk+cLxMhLWH+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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