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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5e9a0ac90b2f24ab3b610b8315c2cf6130026bbd64e97a914682b8d044e36e' 
  AND token = 'Lg9TTi88wyt3KOaphSQa7VzKA3X66IOMBIYA1pIc4Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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