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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13097d3f8e81f1eb48b75a3e763aeb22a5f5bccd4cd90ac2a579c3e32e5797c7' 
  AND token = 'N/55H9645P/95+2L7zYPgskSyRLD9bdNEd/HpuJSCuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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