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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d56fd9608f03e62e7f605e2d5db2f1cf8bad1ec58a3ec05c3598a5ec0264fb' 
  AND token = 'Xx9aTx0aR7fS5JY7yC4Bn/HWsZVovwh4PDdY61UZ0eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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