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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3514c4855a068ca9278776580a78d007ba7b2229572e08b54fad29f1aa8027fc' 
  AND token = 'TdV5vr0/PvfQd+035rxpqdqkPRUawCdWpeov03UO++E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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