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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8952aa85e04762777ab46a5dc912483aa76a4cae10e1db7f3518b02e45bc34' 
  AND token = 'hd+mTnSEWPmk8gvaHVazNdzPVIKKvLMKQ43Eq/0oN5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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