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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336dc07e28c7581fd77ef9d499d8c487a1206950549a2444f1e3a40e9c3ccc1c' 
  AND token = 'kARkbxC+67jRyezD84JexHepemcxiEFQcwaUgwfKJ2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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