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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c156d156c5b44a0dc6931cfe3b0f3e2b08cf27653a0b1a50f5cfd347225bd0' 
  AND token = '39SZl0oWdTq1bYXpGlw2dzqvBPiIqZe5FowpIYUNU98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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