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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d448043faeaa7a17868935563d9ae6f53c7beeb7bd2e5f87ddc62125ac1d044' 
  AND token = 'UpWImojFL5d7Bk5fTPlkOagxXHrCluLlOtSXJsWWJ9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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