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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c154f93cc120632c2fb51bde67265e9ddadbf35f769b6cdc9e57397bd1a18ce6' 
  AND token = 'FXFcHlFMHQ6Tq8Gyi/EHk99x4mTR1uEcF4lgWNCkF2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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