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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d72ceaeeb9da10373f19ece5ace385b5ced68f32d000190193077d7e8b9655' 
  AND token = '/fCQsXzatFOvtRpdnIJ3dVMOMHnd0Dfsxrlwx9h27ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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