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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df2c36895ba58868374e4109be1a000402940ac63b0d06c9af1d5d9adcb39fe' 
  AND token = 'qj9aMY13FHu7lkPmXIO1yuG/BYUCMEGxN5c48WNz6XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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