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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cfc1054c5f2744386a60ffc20b4d1ea621d395c96d1ced29a22a9c1a70e2b8' 
  AND token = 'NT9sUzmFqZi88A4AXrB4stlEdOPqWDwW/blZ2uWrsAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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