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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6360cb866719f3bc06e669554a10df32d131c27d5bb998424b3450a71eea3802' 
  AND token = 'dZLk92InOV3nG4A2YPa61ZkOW6cCuF295KmiVgXs6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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