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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdc7207f35ce55738803eb9e066cd3e7c7c2b6672ea8b05dbb5f3dd6a8a7923' 
  AND token = 'qd3sKTO+DDHHZF56Rzc5XyKbVf3EhnXo32qtpON6TVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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