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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc802dd748ee87b2b9e8d689c0f07abf8eeda7449e0c77d3f21ca5bb48b7000f' 
  AND token = 'yK9z8UY46ocO04omolNsKZ4GSPIhcOBBGwOOoNLbSH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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