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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31399907d92ece8b010248cd3e1c2ef50d149bc6dd0a9b3b6045a26c8626a9e1' 
  AND token = 'cIXF0LR+3ajhsK2dKW0cCqWtJkcTLh/97ytPa94r4gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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