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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbd4cf550009e8870a021bc7c474982a1d55e23b334471b43833d8d8d952ed4' 
  AND token = 'aMI0Up3RQbuLPNNPwRwziONUZJ15qtSfwRubEV44YbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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