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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd308c02d5e88aa4f652bcdd30cdf7112c850c1e1ace66e09eadc9482c78b4dbb' 
  AND token = '8YS4/8KsHALFO5eppa4qhFkssrvKWbApg1Jxz0LKAUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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