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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61507e79b6b50b96ffa9a7a039b0bdfe308c2230be82fc09767f2b1ac645d3bf' 
  AND token = 'byVEFS902kyKtf+VlL/4d0c/sI/ZeIu5mKrkgiflo/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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